Envelope



A. W. ENGEL Oct. 15, 1929.

ENVELOPE Filed Aug. 10, 1925 Patented Oct'. 15, 1929` UNITED; STATES.ALBERT W- ENGEL, or CHICAGO, ILLINOIS ENvELoPE Application ined August1o, 1935. serial No. 49,271.

Figure 1 is a plan view of an envelope embodying this invention showingthe same in .open position.

Figure 2 is a plan view `of said envelope showing the flap partiallyunfolded to disy close its construction.

Figure 3 is a modilication showing the use of an envelope flap embodyingthis invention applied to an otherwise standard -forin of envelope.

As shown in Figure 1 the envelope comprises a front wall, 1, having aclosure flap, 2, extending from its upper edge, said flap being formedwith a pocket whose open edge, 3, is disposed adjacent the crease, 4, atwhich the flap is folded over in closing the envelope. The flap isconveniently formed by cutting the blank for it as shown in Figure 2with a substantiall square outline, forming diagonal creases in thesquare and then removing the triangle remote' from and directly oppositethe crease, 4. This leaves two triangles, 5 and '6, which may be foldeddown over a third triangle, 7, with the part, 6, on top; a

marginal flap, 8, on the triangle, 6, may then be tucked into the pocketthus formed overlapping the triangle, 5, and firmly locking the parts infolded position; A flap of this nature forms a convenient pocket forenclosing small sample articles such as postage stamps, gummed tabs,labels or other stickers or small samples of cloth and the like.' Itwill be evident that this type of Hap may be applied io a standardenvelope such as that shown at 20 in Figure 3. I

In the preferred form of my invention shown in Figures 1 and 2, theenvelope includes a back Wall, 10, having a slit at 11 to receive thepointed tip of the closure flap, 2, and additional flaps, 12, are formedof material continuous with the walls, 1 and 10, at their ends andfolded over upon said walls.

Preferably these end flaps, 12, .include triangular terminal portions,13, which extend into the pocket of the Hap, 2, thus serving to lock theflaps, 12, in their folded position in which they forni four pockets,two on the front Wall and two on the back Wall of the envelope, in pairsopening toward each other and toward the middle of the Width of theenvelope.

At the opposite end of the blank a terminal flap, 14, is turned upv fromthe edge of the back wall, 10; this Hap is' cut apart at the line, 15,so that triangular tabs, 16, may be formed by folding back the cutcorners along the oblique lines,17. By tucking these corners under theflap, 12, as indicated in Figure 1 and serving to lock down the flaps,12, at this end of the blank. If desired the parts may be still moresecurely held in place by the engagement of locking tabs, 18, on theflap, 14, in slots, 19, formed in the two pocket fiaps, 12.

It will be seen that an envelope constructed according -to thisinvention may serve a wide variety of uses and is particularly adaptedto be employed as a merchandise carrier although if desired it may alsobe used to enclose first class inail matter,

I claiin- 1. In an envelope, a body and a closure Hap extending from acreased base line at one side of the body,.said Hap being formed from asubstantially square blank creased at its diagonals and thus sub-dividedinto four triangles, the middle triangle remote from the base line beingcut away and the lateral triangles being folded over each other and overthe remaining middle triangle to forni therewith a pocket opening towardthe base line; one of said lateral triangles having a. locking flapextending substantially throughout the length of the open side of saidpocket and adapted to be tucked into the pocket over the edge of theother lateral triangle to hold them together.

2. An envelope formed from a blank of sheet material folded upon itselfto provide a front wall and a back wall, said sheet including end flapseach extending continuously from the adjoining ends of said Walls, saidadjoining ends being defined by creases along no u which the eni-aps arefolded overthe inner faces of said front and back walls partiallyoverlapping them and .thus forming pockets opening inwardly from theends of the envelope and toward the middle of its length; and a. closureflap on one'of said Walls adapted to overlap 'and engage the other Wall,said closure flap being itself a, pocket joined to one Wall at a line offold and opening toward said line, und said end flaps having terminalportions which extend into the pocket of the closure flap for lockingsaid end flaps in posi` tion.

In testimony whereof. I have hercunfn set my hand at Chicago, Illinois,this 21st day of November, 1923.

ALBERT W'. ENGEL.

